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The ternary indides RE10Ni9+xIn20 (RE = Tb, Dy) were synthesized from the elements by arc‐melting under argon and subsequent annealing. YbNiIn2 was prepared in a sealed tantalum tube in a water‐cooled sample chamber of a high‐frequency furnace. X‐ray powder and single crystal data revealed isotypism with the tetragonal Ho10Ni9In20 type structure, space group P4/nmm for the RE10Ni9+xIn20 compounds: a = 1337.0(2), c = 909.5(2) pm, wR2 = 0.0527, 1795 F2 values, 65 variables for RE = Tb, and a = 1333.63(7), c = 907.2(1) pm, wR2 = 0.0590, 1346 F2 values, 65 variables for RE = Dy. Both indides show an additional nickel site (Ni4) with partial nickel occupancy leading to the refined compositions Tb10Ni9.34(2)In20 and Dy10Ni9.32(2)In20. YbNiIn2 adopts the orthorhombic MgCuAl2‐type structure: Cmcm, a = 430.67(9), b = 1033.0(2), c = 758.1(1) pm, wR2 = 0.0262, 424 F2 values and 16 variable parameters. The crystal chemistry of the RE10Ni9+xIn20 and RENiIn2 compounds is briefly discussed.
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Zaremba et al. (2004) studied this question.
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